Will interface support Multiple Inheritance?

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Hi,

I saw many examples saying Multiple Inheritance can be implemented by Interface. But all those creating me confusion that, Using Interface we are implementing the all the methods(cant see reuse) where as in Inheritance we can reuse existing methods(functionality). So will Interface really support Multiple Inheritance?

Ex:

C#

public interface IA
{
  string IAMethod();
}
public interface IB
{
  string IBMethod();
}

public class C: IA, IB   // Here we are only implementing and No Reuse (Ihneritance?)
{
  public string IAMethod()
  {
    return "IA method called";
  }
  public string IBMethod()
  {
    return "IB method called";
  }

}

Please provide if anybody having best example that clears my confusion...

Posted 27-Jun-12 19:22pm

sarath.ms

Updated 27-Jun-12 20:07pm

JF2015

v3

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Abhinav S · Answer 1 · 2012-06-27T19:32:00

Solution 1

Interface offers multiple inheritance.
This[^] article may help you.

If you search on the internet, you will get tons of more information and articles.

Posted 27-Jun-12 19:32pm

Abhinav S

Comments

Sergey Alexandrovich Kryukov 28-Jun-12 2:06am

Correct, my 5, but it requires additional note I've made. Please see my answer.
--SA

Abhinav S 28-Jun-12 2:09am

Thank you SA.

uspatel · Answer 2 · 2012-06-27T19:35:00

Solution 2

See this thread
http://stackoverflow.com/questions/4121585/why-interface-support-multiple-inheritance-and-class-doesnt-in-c-sharp[^]

Posted 27-Jun-12 19:35pm

uspatel

Comments

Sergey Alexandrovich Kryukov 28-Jun-12 2:07am

It answers the question, my 5. I've added my answer and credited yours, but this is mostly to make Solution 1 more accurate -- on the page you reference it's explained.
--SA

Abhinav S 28-Jun-12 2:10am

Yup. 5.

Sergey Alexandrovich Kryukov · Answer 3 · 2012-06-27T20:05:00

Solution 3

In addition to the correct Solution 1 (Solution 2 actually confirms it):

Not only interfaces are subject to multiple inheritance, but a class or a structure (sic!) can implement more then one interface (but a base class can be only one). Sometimes this is called "weak form of multiple inheritance".

—SA

Posted 27-Jun-12 20:05pm

Sergey Alexandrovich Kryukov

Updated 27-Jun-12 20:20pm

v2

Comments

Abhinav S 28-Jun-12 2:09am

Agreed. 5.

Sergey Alexandrovich Kryukov 28-Jun-12 2:19am

Thank you, Abhinav.
--SA

Sergey Alexandrovich Kryukov · Answer 4 · 2012-06-27T20:05:00

Solution 4

In addition to the correct Solution 1 (Solution 2 actually confirms it):

Not only interfaces are subject to multiple inheritance, but a class or a structure (sic!) can implement more then one interface (but a base class cannot be only one). Sometimes this is called "weak form of multiple inheritance".

—SA

Posted 27-Jun-12 20:05pm

Sergey Alexandrovich Kryukov

Comments

sarath.ms 28-Jun-12 3:02am

Hi SA, thanks for ur respone. For ex, i have a sinerio like this,
public class HP: Printer
{
string getToner()
{
}
}

public class Canon:Printer
{
some methods
//I need to reuse the HP's method - getToner()
}
Can above sinerio be done without creating object to HP?

Sergey Alexandrovich Kryukov 29-Jun-12 18:22pm

Yes, but if you want to reuse this method, move it to some common ancestor class, the class Printer or create some intermediate class. Do you know how virtual functions work, by the way? How is this related to multiple inheritance? To interfaces? If does not look like you need them, but the accurate judgement could be only done based on the complete type hierarchy...
--SA

wizardzz 28-Jun-12 11:46am

Repost.